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Finding the Fourth Proportional to 103,639.85, 155,368.65 and 70,251.65

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Solution

The fourth proportional to 103,639.85, 155,368.65 and 70,251.65 is: 105,315.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,639.85 : 155,368.65 = 70,251.65 : x
  2. Step 2: Convert to fraction form
    103,639.85/155,368.65 = 70,251.65/x
  3. Step 3: Cross multiply
    103,639.85x = 155,368.65 × 70,251.65
  4. Step 4: Simplify right side
    103,639.85x = 10,914,904,020.77
  5. Step 5: Solve for x
    x = 10,914,904,020.77/103,639.85
  6. Step 6: Final answer
    x = 105,315.71

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.